Calcite
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| Frequency | common |
|---|---|
| Hardness | 3 |
| Density | 2.71 |
| Chemical Formula | CaCO3 |
| Core Elements | Ca |
| Thermal Decomposition | CaCO3
900°C CaO |
Calcite is nearly pure calcium carbonate. It could be considered an ore of calcium, but calcium is rarely desired in elemental form, and isolating it is difficult.